CyberSecBulletin
CVE-2026-103922NVD status: Awaiting Analysis

capacitor: Origin Validation Error

Published Updated By the CyberSecBulletin desk

CVE-2026-103922 is a critical-severity origin validation error vulnerability in capacitor from Ionic-team, with a CVSS 3.1 base score of 9.3 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. Affected capacitor versions: >= 6.0.0, < 6.2.2; >= 7.0.0, < 7.6.9; >= 8.0.0, < 8.3.5, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.41% chance of exploitation within 30 days, which is low compared with other CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Check which version of capacitor you run against the affected versions below, and install the vendor's latest release.
  2. Read the advisory on github.com for workarounds and exact fixed builds.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
  4. Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.

Affected products and versions

VendorProductAffected versionsFixed in
Ionic-teamcapacitor>= 6.0.0, < 6.2.2; >= 7.0.0, < 7.6.9; >= 8.0.0, < 8.3.5; >= 8.3.5, < 8.4.3; >= 8.5.0, < 8.5.1Not stated
@capacitorandroid>= 8.5.0, < 8.5.1; >= 8.3.5, < 8.4.3; >= 8.0.0, < 8.3.5; >= 7.0.0, < 7.6.9; >= 6.0.0, < 6.2.2Not stated
@capacitorios>= 8.5.0, < 8.5.1; >= 8.3.5, < 8.4.3; >= 8.0.0, < 8.3.5; >= 7.0.0, < 7.6.9; >= 6.0.0, < 6.2.2Not stated
Com.capacitorjscore>= 8.5.0, < 8.5.1; >= 8.3.5, < 8.4.3; >= 8.0.0, < 8.3.5; >= 7.0.0, < 7.6.9; >= 6.0.0, < 6.2.2Not stated
Swiftgithub.com/ionic-team/capacitor-swift-pm>= 8.5.0, < 8.5.1; >= 8.3.5, < 8.4.3; >= 8.0.0, < 8.3.5; >= 7.0.0, < 7.6.9; >= 6.0.0, < 6.2.2Not stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
RequiredA user must take an action such as opening a file or link.
Scope
ChangedThe attack can reach beyond the vulnerable component into other systems.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
NoneAvailability is not affected.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N. Scored by CNA (github.com).

Official description

Capacitor is a cross-platform native runtime for web applications. From 6.0.0 until 6.2.2, 7.6.9, 8.3.5, 8.4.3, and 8.5.1, the Android and iOS WebView navigation guard validates a target URL's host and scheme but not its path, allowing a victim who activates an untrusted link to navigate a frame to /_capacitor_http_interceptor_. The native proxy can fetch an attacker-selected URL and return the response as a document at the application's own origin, allowing script in that response to access same-origin storage, cookies, and registered Capacitor plugin capabilities. Applications remain affected when CapacitorHttp is disabled because affected releases serve the proxy path regardless of that setting. This issue is fixed in versions 6.2.2, 7.6.9, 8.3.5, 8.4.3, and 8.5.1.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Origin Validation Error

The product does not properly verify that the source of data or communication is valid.

More Origin Validation Error vulnerabilities (CWE-346)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Origin Validation Error vulnerabilities

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